Definition
Heuristics are mental shortcuts or “rules of thumb” that the brain uses to solve problems and make decisions quickly and efficiently. While often useful as “90 percent rules,” they frequently lead to systematic errors known as cognitive biases.
Why It Matters
These “mental shortcuts” allow humans to make fast, reasonably accurate decisions in complex environments without getting bogged down in exhaustive analysis. Understanding both their utility and their biases is the key to improving human judgment and designing better AI systems.
Core Concepts
- Fast and Frugal: Heuristics prioritize speed and low cognitive load over perfect accuracy. They are “good enough” for most daily situations.
- Unit Bias: The tendency to focus on one salient feature (e.g., megahertz in computers, megapixels in cameras, girth in weight estimation) as the sole measure of value or quality.
- Leftmost Digit Heuristic: Focusing on the first digit to quickly estimate magnitude, making 2.00.
- The Heuristic Trap: When a shortcut designed for a specific context (e.g., social interaction) is applied to an abstract or statistical problem where it no longer functions correctly.